First patch in making destructors of refcounted objects private.

base/directory_watcher.h

Index: base/directory_watcher.h
===================================================================
--- base/directory_watcher.h	(revision 30973)
+++ base/directory_watcher.h	(working copy)
@@ -46,9 +46,13 @@
   // Used internally to encapsulate different members on different platforms.
   class PlatformDelegate : public base::RefCounted<PlatformDelegate> {
    public:
-    virtual ~PlatformDelegate() {}
     virtual bool Watch(const FilePath& path, Delegate* delegate,
                        MessageLoop* backend_loop, bool recursive) = 0;
+
+   protected:
+    friend class base::RefCounted<PlatformDelegate>;
+
+    virtual ~PlatformDelegate() {}
   };
 
  private: